Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones

Color-induced changes in stones due to heating can be useful in determining the degree of degradation generated in their components and structure. We evaluate the effect of heating in three types of limestones, useful in building and restoration, corresponding to biomicrite (BC), biosparite (BS), an...

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Autores principales:	J. May-Crespo, P. Martínez-Torres, P. Quintana, J. J. Alvarado-Gil, L. Vilca-Quispe, N. Camacho
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/cfab11359ee54f00bf9d1de832654ee8
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spelling	oai:doaj.org-article:cfab11359ee54f00bf9d1de832654ee82021-11-08T02:37:26ZStudy of the Effects of Heating on Organic Matter and Mineral Phases in Limestones2314-493910.1155/2021/9082863https://doaj.org/article/cfab11359ee54f00bf9d1de832654ee82021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/9082863https://doaj.org/toc/2314-4939Color-induced changes in stones due to heating can be useful in determining the degree of degradation generated in their components and structure. We evaluate the effect of heating in three types of limestones, useful in building and restoration, corresponding to biomicrite (BC), biosparite (BS), and intramicrite (IM), in the range of temperature from 100°C to 600°C. Our analyses indicate that the strongest changes in reflectance occur in the samples of intramicrite, followed by biomicrite, being biosparite showing the smallest ones. Additionally, IM samples suffer the largest modifications in effective porosity due to the thermal treatment; in contrast, BS and BC samples show smaller temperature-induced alterations associated with smaller changes in reflectance. Moreover, we reveal that most of the thermally induced variations are associated, in this range of temperature, to the dehydroxylation of goethite that transforms into hematite, as well as by the burning and partial release of the organic matter present in the rock. Colorimetry analyses show that the sequence of thermally induced changes can be followed by the evolution of the three coordinates, L∗ (lightness), a∗ (red-green), and b∗ (yellow-blue), of the CIE 1976 L∗a∗b∗ space.J. May-CrespoP. Martínez-TorresP. QuintanaJ. J. Alvarado-GilL. Vilca-QuispeN. CamachoHindawi LimitedarticleOptics. LightQC350-467ENJournal of Spectroscopy, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Optics. Light QC350-467
spellingShingle	Optics. Light QC350-467 J. May-Crespo P. Martínez-Torres P. Quintana J. J. Alvarado-Gil L. Vilca-Quispe N. Camacho Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones
description	Color-induced changes in stones due to heating can be useful in determining the degree of degradation generated in their components and structure. We evaluate the effect of heating in three types of limestones, useful in building and restoration, corresponding to biomicrite (BC), biosparite (BS), and intramicrite (IM), in the range of temperature from 100°C to 600°C. Our analyses indicate that the strongest changes in reflectance occur in the samples of intramicrite, followed by biomicrite, being biosparite showing the smallest ones. Additionally, IM samples suffer the largest modifications in effective porosity due to the thermal treatment; in contrast, BS and BC samples show smaller temperature-induced alterations associated with smaller changes in reflectance. Moreover, we reveal that most of the thermally induced variations are associated, in this range of temperature, to the dehydroxylation of goethite that transforms into hematite, as well as by the burning and partial release of the organic matter present in the rock. Colorimetry analyses show that the sequence of thermally induced changes can be followed by the evolution of the three coordinates, L∗ (lightness), a∗ (red-green), and b∗ (yellow-blue), of the CIE 1976 L∗a∗b∗ space.
format	article
author	J. May-Crespo P. Martínez-Torres P. Quintana J. J. Alvarado-Gil L. Vilca-Quispe N. Camacho
author_facet	J. May-Crespo P. Martínez-Torres P. Quintana J. J. Alvarado-Gil L. Vilca-Quispe N. Camacho
author_sort	J. May-Crespo
title	Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones
title_short	Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones
title_full	Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones
title_fullStr	Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones
title_full_unstemmed	Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones
title_sort	study of the effects of heating on organic matter and mineral phases in limestones
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/cfab11359ee54f00bf9d1de832654ee8
work_keys_str_mv	AT jmaycrespo studyoftheeffectsofheatingonorganicmatterandmineralphasesinlimestones AT pmartineztorres studyoftheeffectsofheatingonorganicmatterandmineralphasesinlimestones AT pquintana studyoftheeffectsofheatingonorganicmatterandmineralphasesinlimestones AT jjalvaradogil studyoftheeffectsofheatingonorganicmatterandmineralphasesinlimestones AT lvilcaquispe studyoftheeffectsofheatingonorganicmatterandmineralphasesinlimestones AT ncamacho studyoftheeffectsofheatingonorganicmatterandmineralphasesinlimestones
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Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones

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